The correct option is D. The development of agriculture opened the way of civilization for native Americans in Mexico and South America. The cultivation of maize in large quantity especially brought about trading with neighboring cities and towns and open up irrigation system and increased the population density of Mexico and South America.
It would be "Cottage craftsmen grew wealthier because of their specialized skills" that was not a consequence of the Industrial Revolution, since machines took the place of many individual craftsmen.
Gladiators were usually slaves, criminals, or prisoners of war—the Romans knew that the best way to orchestrate a fight to the death was to use men who have nothing to lose.
